Singlet superconductivity in single-crystal NiBi3 superconductor

Abstract

Andreev reflection spectroscopy with unpolarized and highly spin-polarized currents has been utilized to study an intermetallic single-crystal superconductor NiBi3. Magnetoresistance at zero bias voltage of point contacts shows the occurrence and suppression of Andreev reflection by unpolarized and polarized current, respectively. The gap value, its symmetry and temperature dependence have been determined using an unpolarized current. The spin state in the NiBi3 sample is determined to be antiparallel using a highly spin-polarized current. The gap value 2Delta/kBT, gap symmetry and its temperature dependence, combined with the antiparallel spin state show that the bulk NiBi3 is a singlet s-wave superconductor.

arXiv comment21 pages, 6 figures

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Cited by in corpus (7)

• Superconductivity in the Bi/Ni bilayer
• On the Origin of Superconductivity at Nickel-Bismuth Interfaces
• Effect of pressure on the physical properties of the superconductor NiBi3
• Fully-gapped superconductivity with preserved time-reversal symmetry in NiBi${}_3$ single crystals
• Absence of spontaneous time-reversal symmetry breaking and ferromagnetism in superconducting NiBi3 single crystal
• Ni/Bi bilayers: The effect of thickness on the superconducting properties
• Enhancement of vortex liquid phase and reentrant behavior in NiBi3 single crystals